In 1976, he was accused of having made a $92,000 windfall profit in the "Sky Shops" scandal through the timely purchase and sales of shares in Sky Shops Ltd., allegedly profiting from influence peddling to reverse a 1972 government decision not to renew its concession to operate duty-free shops at Montreal's airports renewed in 1972.[2] It was also alleged that two Montreal businessmen involved with Sky Shops, one of whom as National Hockey League president Clarence Campbell,[3] had offered Giguère the money in exchange for his assistance in lobbying government officials to overturn the decision to end the concession. Giguère and the two men were charged with conspiring to accept a benefit[4] While the two businessmen were convicted of bribing Giguère and fined, he himself was acquitted in a separate trial due to a lack of incriminating evidence.[5]

Giguère retired from the Senate in 1986 upon reaching the mandatory retirement age of 75.